GMC 2008 Envoy - Manual (Page 236)

PROG (Program): Press this button to play a station
that has been programmed on the radio preset
pushbuttons. The radio seeks preset stations only
with a strong signal that are in the selected band.
When a CD is playing in the CD changer, press this
button to go to the next available CD, if multiple CDs are
loaded.
Q
SOURCE
R
: Press the SOURCE arrows to switch
between FM1, FM2, AM, or XM1 or XM2 (if equipped),
or a CD. If a CD is loaded the CD symbol displays.
Q
SEEK
R
: Press the SEEK arrows to go to
the previous or the next radio station and stay there.
The radio seeks stations only with a strong signal
that are in the selected band.
When a CD is playing, press the SEEK arrows to fast
forward or reverse.
Q
VOL
R
(Volume): Press the VOL arrows to
increase or to decrease the volume.
Radio Reception
Frequency interference and static during normal radio
reception can occur if items such as cellphone chargers,
vehicle convenience accessories, and external electronic
devices are plugged into the accessory power outlet. If
there is interference or static, unplug the item from the
accessory power outlet.
AM
The range for most AM stations is greater than for FM,
especially at night. The longer range can cause station
frequencies to interfere with each other. For better radio
reception, most AM radio stations boost the power levels
during the day, and then reduce these levels during the
night. Static can also occur when things like storms and
power lines interfere with radio reception. When this
happens, try reducing the treble on your radio.
FM Stereo
FM stereo gives the best sound, but FM signals reach
only about 10 to 40 miles (16 to 65 km). Tall buildings or
hills can interfere with FM signals, causing the sound
to fade in and out.
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